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Chapter Summary

Dispersion and Scattering of Light

NIOS · Class 12 · Physics

Summary of Dispersion and Scattering of Light for NIOS Class 12 Physics. Key concepts, important points, and chapter overview.

45 questions38 flashcards5 concepts

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Overview

When white sunlight passes through a glass prism, it splits into a beautiful band of seven colours — violet, indigo, blue, green, yellow, orange, and red (VIBGYOR). This splitting is called dispersion of light. Similarly, when we look at the blue sky or witness a breathtaking rainbow after rain, we

Key Concepts

Dispersion is the splitting of white

Dispersion is the splitting of white (polychromatic) light into its constituent colours (wavelengths) when it passes through an optically denser mediu

The refractive index μ of

The refractive index μ of a medium is defined as μ = c/v, where c is the speed of light in vacuum and v is the speed in the medium. Since c = νλₐ and

When a ray PQ enters

When a ray PQ enters a prism ABC at face AB with angle of incidence i, it refracts inside the prism (angle r₁), travels to face AC, and emerges with a

As the angle of incidence i

As the angle of incidence i is varied, the angle of deviation δ first decreases, reaches a minimum value δm, and then increases again. This minimum de

Angular Dispersion is the difference

Angular Dispersion is the difference in deviation angles for two extreme colours of the visible spectrum: Angular Dispersion = δV - δR. The yellow col

Learning Objectives

  • Explain the phenomenon of dispersion of light and understand why it occurs in optically denser media
  • Derive the relation between angle of deviation (δ), angle of prism (A), and refractive index (μ) of the prism material
  • Understand the concept of minimum deviation and use the formula μ = sin((A+δm)/2) / sin(A/2) to solve numerical problems
  • Define angular dispersion and dispersive power, and calculate them using the formula ω = (μV - μR)/(μY - 1)
  • Explain the formation of primary and secondary rainbows using the principles of refraction, internal reflection, and dispersion

Frequently Asked Questions

What are the important topics in Dispersion and Scattering of Light for NIOS Class 12 Physics?
Key topics in Dispersion and Scattering of Light include Chapter Overview: Dispersion and Scattering of Light, Mind map showing the two major topics of the chapter — Dispersion and Scattering — with their key sub-concepts, Flowchart showing how white light entering a denser medium splits into colours due to different refractive indices for different wavelengths. These are the concepts NIOS Class 12 examiners draw on most — study them first, then practise related questions.
How to score full marks in Dispersion and Scattering of Light — NIOS Class 12 Physics?
Understand the core concepts first, then work through the 45 practice questions available for this chapter. Revise formulas and definitions regularly, and use flashcards for quick recall before the exam.

Sources & Official References

Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.

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